Deuterium trapping and release in JET ITER-like wall divertor tiles

TY - JOUR

T1 - Deuterium trapping and release in JET ITER-like wall divertor tiles

AU - Likonen, J.

AU - Heinola, K.

AU - De Backer, A.

AU - Koivuranta, S.

AU - Hakola, A.

AU - Ayres, C. F.

AU - Baron-Wiechec, A.

AU - Coad, P.

AU - Matthews, G. F.

AU - Mayer, M.

AU - Widdowson, A.

N1 - Publisher Copyright: © 2016 EUROfusion.

PY - 2016/1/25

Y1 - 2016/1/25

N2 - A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.

AB - A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.

KW - JET

KW - deuterium

KW - retention

UR - http://www.scopus.com/inward/record.url?scp=84959894956&partnerID=8YFLogxK

U2 - 10.1088/0031-8949/T167/1/014074

DO - 10.1088/0031-8949/T167/1/014074

M3 - 会议文章

AN - SCOPUS:84959894956

SN - 0281-1847

VL - 2016

JO - Physica Scripta

JF - Physica Scripta

IS - T167

M1 - 014074

T2 - 15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015

Y2 - 18 May 2015 through 22 May 2015

ER -